人民长江2024，Vol.55Issue(8)：210-215,230,7.DOI:10.16232/j.cnki.1001-4179.2024.08.028
考虑局部缺陷的大断面隧道非线性承载性能研究
Research on nonlinear bearing performance of large section tunnels considering local imperfections
摘要
Abstract
Large section lining segments are widely used in drainage tunnels,underwater tunnels and other fields in water re-sources and hydropower engineering.The manufacturing errors and local imperfections caused by piling and operation will influ-ence the bearing capacity of the segment lining structures.For this reason,a calculation method for the nonlinear bearing perform-ance of large section segments considering initial imperfections was proposed.Aiming at two typical imperfections,out-of-flat-ness imperfection mode and radial dislocation imperfection mode,through considering different imperfection amplitudes,local im-perfection mode and imperfection distribution,we analyzed the ultimate bearing capacity values of large section lining segments.The results show that the local geometric imperfections mainly have adverse effects on the bearing capacity of segments,and the corresponding loading coefficient is affected by different imperfection amplitudes,with a variation trend of linearly increasing first,nonlinear gently increasing and coming to a convergence.For the local geometric imperfections,the influence is small for single and multi-slice imperfection cases,while the influence is relatively large for half-span and full-span cases.In practical engi-neering,comprehensively considering the superimposed adverse influence of each single-factor imperfection forms,the reduction coefficient of segment ultimate loading coefficient is suggested as 0.80～0.85.关键词
隧道衬砌/局部缺陷/非线性稳定/缺陷分布/折减系数Key words
tunnel lining/local imperfections/nonlinear stability/imperfection distribution/reduction coefficient分类
交通工程引用本文复制引用
周奇辉,张琼方,王震,丁智,孙苗苗,吴梦琴..考虑局部缺陷的大断面隧道非线性承载性能研究[J].人民长江,2024,55(8):210-215,230,7.基金项目
国家自然科学基金项目(52178400) （52178400）
浙江省重点研发计划项目(2020C01102) （2020C01102）
杭州市农业与社会发展科研项目(202203B39) （202203B39）
